Allow extensions to be disabled

[csreddy]

Issue

Docker for Mac on Apple Silicon MacBooks fail to run SAM containers containing Rust Lambda extensions. This is affecting services that offer SAM based features and customers are blocked. Not sure if the problem is in Docker or Lambda runtime.

cc @valerena

Issues:

• Synthetics - [ERROR] (rapid) Invoke failed error=ErrAgentNameCollision  aws-samples/synthetics-canary-local-debugging-sample#1
• SAM - Bug: Unable to run sam local invoke on Apple Silicon aws-sam-cli#7061

Error

START RequestId: 339c53f8-6e0e-4092-8962-421b6b4b1f06 Version: $LATEST 22 May 2024 05:13:35,686 [ERROR] (rapid) Init failed error=exit status 127 InvokeID= 22 May 2024 05:13:35,687 [ERROR] (rapid) Invoke failed error=ErrAgentNameCollision InvokeID=445da4b1-6e01-4662-90e3-10dfaba11e96 22 May 2024 05:13:35,687 [ERROR] (rapid) Invoke DONE failed: Sandbox.Failure 

Description of changes

Introducing new env variable AWS_LAMBDA_RIE_DISABLE_EXTENSIONS to disable extensions. With this feature customers can get around the problem by setting this env var in SAM template.

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[valerena]

It looks good! The only thing I would ask is if you can add information about this on the README. Probably at the end of "How to configure", a small section describing the existence of this environment variable and what it does.

[csreddy]

Sure.

[csreddy]

Same set of tests are failing even without my changes. I even tried by not including the extension in the docker image and still the same tests failing confirming that failures already existed, probably flaky. We may need to adjust the expected values in the tests to account for the longer delays to make the tests more stable. We could consider conditionally checking for long delays only for arm64 arch keeping amd64 values unchanged.